Howard J. Rogers wrote:
> Le JeanMimi wrote:
>
>
>>Hello,
>>
>>Is it possible to run more than one RAC instance on the same machine ?
>
>
>
> Of course it is. RAC is the clustering of instances. Not the clustering of
> servers.
>
> It is, of course, completely stupid to do so. But yes, it's possible. Check
> out www.dizwell.com, Laptop RAC article for proof.
>
>
>>(to be exact : more than one RAC instance on the same IBM P690 machine
>>partition - AIX 5.2) ?
>>
>>(we hope so ;)
>>
>>For instance :
>>
>>Machine Partition 1
>>instance "A1" for the database "A"
>>instance "B1" for the database "B"
>>instance "C1" for the database "C"
>>
>>Machine Partition 2
>>instance "A2" for the database "A"
>>instance "B2" for the database "B"
>>instance "C2" for the database "C"
>>
>>Same software version for all db.
>>Btw is it necessary to have separate interconnect sets or can all the
>>databases share the same interconnect ?
>
>
> The interconnect is everything to do with hardware clustering. Instance
> clustering is a completely separate issue.
>
> Why won't people see the two things as entirely separate?! Then the answers
> to these sorts of questions would be obvious!
>
> Of course multiple INSTANCES (not databases, since they don't coordinate
> with each other) can make use of one cluster interconnect. Instances make
> use of whatever hardware clustering technology is made available to them.
> They bring none of their own.
>
> HJR
I answered the opposite way about the interconnect because I was
thinking that it is often the weakest link and would quickly bring the
entire thing to a screaching halt. Howard is correct that there is not
technical reason. We agree on that and we agree that it is completely
stupid to do so. Two agreements in a day so I'll stop there before he
thinks I'm toadying up again.
--
Daniel A. Morgan
University of Washington
damorgan_at_x.washington.edu
(replace 'x' with 'u' to respond)
Received on Fri Oct 29 2004 - 21:14:39 CDT
